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A268998 Number of 4Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 1
16, 126, 849, 6009, 37987, 244397, 1506570, 9258784, 55904997, 335264275, 1991983545, 11763490813, 69051103048, 403375829894, 2346089237885, 13593697842329, 78497992061491, 451930855824889, 2594820580805818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A268995.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 2*a(n-1) +39*a(n-2) +14*a(n-3) -482*a(n-4) -1102*a(n-5) -111*a(n-6) +1758*a(n-7) +982*a(n-8) -1114*a(n-9) -743*a(n-10) +394*a(n-11) +206*a(n-12) -90*a(n-13) -17*a(n-14) +10*a(n-15) -a(n-16)

EXAMPLE

Some solutions for n=4

..0..1..0..1. .0..1..0..0. .1..1..0..1. .1..0..0..0. .1..0..0..0

..0..1..0..0. .1..0..0..1. .0..0..0..0. .1..0..1..1. .0..1..0..0

..0..0..0..0. .1..0..0..0. .0..0..0..0. .0..0..0..0. .0..1..0..0

..1..1..0..0. .0..1..0..0. .1..0..0..0. .0..1..0..1. .0..0..0..1

CROSSREFS

Cf. A268995.

Sequence in context: A007787 A067470 A133111 * A253319 A291460 A004017

Adjacent sequences:  A268995 A268996 A268997 * A268999 A269000 A269001

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2016

STATUS

approved

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Last modified November 15 13:20 EST 2019. Contains 329149 sequences. (Running on oeis4.)